| psi | Pounds force of pressure per square inch. (05 Dec 1998) |
|---|---|
| psi factor | A protein responsible for the specific initiation of the RNA polymerase-catalyzed reaction at the promoter sites of genes. (05 Mar 2000) |
| psi phenomenon | A phenomenon that includes both psychokinesis and extrasensory perception; the extrasensory mental processes involved in the alleged ability to send or receive telepathic messages. (05 Mar 2000) |
| compressor | 1. A muscle, contraction of which causes compression of any structure. 2. An instrument for making pressure on a part, especially on an artery to prevent loss of blood. Synonym: compressorium. (05 Mar 2000) |
| compressor muscle of lips | <anatomy> The "sucking muscle," a labial muscle formed by sagittal fibres running from the skin to the mucous membrane. Synonym: Aeby's muscle, Bovero's muscle, compressor muscle of lips, Klein's muscle, Krause's muscle, mucocutaneous muscle, musculus cutaneomucosus. (05 Mar 2000) |
| compressor venae dorsalis penis | A variation of the bulbospongiosus muscle in which some fibres pass dorsal to the dorsal vein of the penis; thought at one time to be an important component in the mechanism of erection. Synonym: Houston's muscle. (05 Mar 2000) |
| musculus compressor naris | See: nasalis muscle. (05 Mar 2000) |
| musculus compressor urethrae | Origin, ramus of pubis; insertion, with fellow in median raphe behind and in front of urethra; action, constricts membranous urethra; nerve supply, pudendal. Synonym: musculus sphincter urethrae, external urethral sphincter, Guthrie's muscle, musculus compressor urethrae, musculus constrictor urethrae, musculus sphincter urethrae membranaceae, sphincter muscle of urethra, Wilson's muscle. (05 Mar 2000) |